linux-kernel - [syzbot] [bcachefs?] INFO: task hung in truncate

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Message-ID: <0000000000003a318c061ac844e2@google.com>
Date: Thu, 13 Jun 2024 09:48:20 -0700
From: syzbot <syzbot+c6773f706de1990de039@...kaller.appspotmail.com>
To: bfoster@...hat.com, kent.overstreet@...ux.dev, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] INFO: task hung in truncate_setsize

Hello,

syzbot found the following issue on:

HEAD commit:    cea2a26553ac mailmap: Add my outdated addresses to the map..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=137e8e9c980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c79815c08cc14227
dashboard link: https://syzkaller.appspot.com/bug?extid=c6773f706de1990de039
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0dd89d349f79/disk-cea2a265.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/155ef1ec00f0/vmlinux-cea2a265.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0caa129cf368/bzImage-cea2a265.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c6773f706de1990de039@...kaller.appspotmail.com

INFO: task syz-executor.1:10394 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc3-syzkaller-00022-gcea2a26553ac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:16192 pid:10394 tgid:10393 ppid:9778   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 io_schedule+0x8d/0x110 kernel/sched/core.c:9043
 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307
 truncate_inode_pages_range+0xaaf/0xfc0 mm/truncate.c:412
 truncate_inode_pages mm/truncate.c:439 [inline]
 truncate_pagecache mm/truncate.c:732 [inline]
 truncate_setsize+0xcf/0xf0 mm/truncate.c:757
 bchfs_truncate+0x683/0xc80 fs/bcachefs/fs-io.c:453
 notify_change+0xb9d/0xe70 fs/attr.c:497
 do_truncate+0x220/0x310 fs/open.c:65
 handle_truncate fs/namei.c:3308 [inline]
 do_open fs/namei.c:3654 [inline]
 path_openat+0x2a3d/0x3280 fs/namei.c:3807
 do_filp_open+0x235/0x490 fs/namei.c:3834
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_creat fs/open.c:1496 [inline]
 __se_sys_creat fs/open.c:1490 [inline]
 __x64_sys_creat+0x123/0x170 fs/open.c:1490
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff79e87cea9
RSP: 002b:00007ff79f6840c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007ff79e9b3f80 RCX: 00007ff79e87cea9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000


---
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